Dark World: Evolution of the Gods Begins from Kaneki Ken

The girl was silently dazed. When others wake up in the mirror, what appears is exactly the same version of themselves, but when I wake up, why is it a man who looks completely different from me? Sometimes he would turn into a white-haired man, wearing a mask, with a few dark red tentacles sticking out from his waist. He was so handsome that I was fascinated by him. Sometimes it turns into a little yellow mouse with electric lights emitting from its body. It screams and screams. It is absolutely adorable to everyone. It is so cute. What is it this time? Hey! Hey, teacher, you may not believe it, but a mecha just appeared in my house! What do I do! Help! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.